Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NT9O callsign genealogy
Currently held by SUMMERS, DAVID O
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by NT9O's current licensee, walking backwards.
- SUMMERS, DAVID OINgranted 2009-01-28cancelled 2010-02-20
Successor callsigns
Callsigns held now by people who previously held NT9O.
- SIDOR, LARRY WINgranted 2006-09-13cancelled 2015-02-23